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Rhynchomonas nasuta (rink-owe-moan-ass), a kinetoplastid flagellate. Arguably the most widespread heterotrophic flagellate - so fare found in northern and southern hemispheres, Atlantic and Pacific, surface waters and in deep sediments, coastal and oceanic, in water column and in sediments, in soils and freshwater habitats, in waters so salty the salt is crystallizing and from guaranteed anoxic habitats. There are two flagella, but the front one supports an expanded lobe of cytoplasm which includes the mouth and looks a bit like a nose or a proboscis. Posterior flagellum is acronematic - in that the posterior section is thinner than the bit nearer the body. Eats bacteria through its nose. Phase contrast.
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Rhynchomonas nasuta (rink-owe-moan-ass), a kinetoplastid flagellate. Arguably the most widespread heterotrophic flagellate - so fare found in northern and southern hemispheres, Atlantic and Pacific, surface waters and in deep sediments, coastal and oceanic, in water column and in sediments, in soils and freshwater habitats, in waters so salty the salt is crystallizing and from guaranteed anoxic habitats. There are two flagella, but the front one supports an expanded lobe of cytoplasm which includes the mouth and looks a bit like a nose or a proboscis. Eats bacteria through its nose. Phase contrast.
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Rhynchomonas (rink-owe-moan-ass) one of these most widely distributed of all eukaryotes, having been found in marine and freshwater sites all round the world, in anoxic sites and in sites with so much salt that crystals form. Its tolerance for extremes now also illustrated by its occurrence in a thermal stream. This is a bodonid, the anterior nose contains a mouth with which it eats bacteria, and with one trailing flagellum which narrows towards the posterior end. Phase contrast. Material from Nymph Creek, thermal sites within Yellowstone National Park, photograph by Kathy Sheehan and David Patterson.
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Rhynchomonas (rink-owe-moan-ass) nasuta Klebs, 1893. Cells are 3.5 to 6 microns long and flattened. The cells are flexible with a bulbous motile snout. The snout, which contains a mouth, beats slowly. The anterior flagellum lies alongside the snout and is hard to see, and the trailing flagellum is about 2 to 2.7 times the cell length, and is acronematic. The cells consume attached bacteria. The cells move by gliding. Commonly observed.
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Rhynchomonas nasuta (Stokes, 1888) Klebs, 1893. Cells are 3.5 to 6 microns long and flattened. The cells are flexible with a bulbous motile snout. The snout, which contains a mouth, beats slowly. The anterior flagellum lies alongside the snout and is hard to see, and the trailing flagellum is about 2 to 2.7 times the cell length, and is acronematic. The cells consume attached bacteria. The cells move by gliding. Commonly observed.
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Single Rgynchomonas nasuta gliding over a field of bacteria - its food. Phase contrasty micrograph.
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Gliding cell, trailing flagellum just out of focus, snout is short and held close to the cell.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.
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Three profiles of Rhynchomonas isolated from Little Sippiwissett Marsh, Massachusetts. Phase contrast image by Banoo Malik.
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